Remove from the Reference Manual PDF generation script the references to the pages of the built-in predicate `forall/2` and `retractall/1`
Remove from the Reference Manual PDF generation script the references to the pages of the built-in predicate `forall/2` and `retractall/1`

LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3